Throttle Body size?
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Joined: Jul 2006
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Throttle Body size?
I feel stupid for asking this but does anybody know the stock/factory size throttle body for a '88 IROC LB9 (305 TPI)? I'm looking to get a new one soon and i wanna go bigger but i'm wondering what would be the best size to get. Has anybody put a couple on their LB9 and knows which size is better? 52or 58mm? Thanks for any help guys.
Joined: Apr 2005
Posts: 7,736
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From: Not in Kansas anymore
Car: 82 Z28
Engine: 383 SP EFI/ 4150 TB
Transmission: T400
Axle/Gears: QP 9" 3.73
Re: Throttle Body size?
Need some good mods to go above stock 48mm on a 350
The GMPP RamJet 502 ci big block comes with the same 48mm TB so I wouldn't be wasting your $$$ with larger on a 305
The GMPP RamJet 502 ci big block comes with the same 48mm TB so I wouldn't be wasting your $$$ with larger on a 305
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Joined: Nov 2003
Posts: 1,629
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From: Somewhere
Car: 88 IROC
Engine: 305 TPI
Transmission: 700R4
Axle/Gears: 10 bolt 3.73
Re: Throttle Body size?
48mm is stock. I have a 52mm on my car and it made no difference in performance. You would be better porting your plenum, smooth out the bumps inside. Once you build up the motor a bigger throttle body would be in order.
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